Fixed major performance issue with matrix arithmetic; please merge to 5.3.2

The fix consists of three parts:

1. Rewriting `inline-matrix*'. The material change here is that the
   expansion now contains only direct applications of `+' and `*'.
   TR's optimizer replaces them with `unsafe-fx+' and `unsafe-fx*',
   which keeps intermediate flonum values from being boxed.

2. Making the types of all functions that operate on (Matrix Number)
   values more precise. Now TR can prove that matrix operations preserve
   inexactness. For example, matrix-conjugate : (Matrix Flonum) ->
   (Matrix Flonum) and three other cases for Real, Float-Complex, and
   Number.

3. Changing the return types of some functions that used to return
   things like (Matrix (U A 0)). Now that we worry about preserving
   inexactness, we can't have `matrix-upper-triangle' always return a
   matrix that contains exact zeros. It now accepts an optional `zero'
   argument of type A.